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rOACCT/node_modules/@emotion/babel-plugin/src/utils/transform-expression-with-styles.js
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transform-expression-with-styles.js
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			// @flow

			import { serializeStyles } from '@emotion/serialize'
			import minify from './minify'
			import { getLabelFromPath } from './label'
			import { getSourceMap } from './source-maps'
			import { simplifyObject } from './object-to-string'
			import {
			appendStringReturningExpressionToArguments,
			joinStringLiterals
			} from './strings'
			import createNodeEnvConditional from './create-node-env-conditional'

			const CSS_OBJECT_STRINGIFIED_ERROR =
			"You have tried to stringify object returned from `css` function. It isn't supposed to be used directly (e.g. as value of the `className` prop), but rather handed to emotion so it can handle it (e.g. as value of `css` prop)."

			export let transformExpressionWithStyles = ({
			babel,
			state,
			path,
			shouldLabel,
			sourceMap = ''
			}: {
			babel: *,
			state: *,
			path: *,
			shouldLabel: boolean,
			sourceMap?: string
			}): * => {
			const autoLabel = state.opts.autoLabel \|\| 'dev-only'
			let t = babel.types
			if (t.isTaggedTemplateExpression(path)) {
			if (
			!sourceMap &&
			state.emotionSourceMap &&
			path.node.quasi.loc !== undefined
			) {
			sourceMap = getSourceMap(path.node.quasi.loc.start, state)
			}
			minify(path, t)
			}

			if (t.isCallExpression(path)) {
			const canAppendStrings = path.node.arguments.every(
			arg => arg.type !== 'SpreadElement'
			)

			path.get('arguments').forEach(node => {
			if (t.isObjectExpression(node)) {
			node.replaceWith(simplifyObject(node.node, t))
			}
			})

			path.node.arguments = joinStringLiterals(path.node.arguments, t)

			if (
			!sourceMap &&
			canAppendStrings &&
			state.emotionSourceMap &&
			path.node.loc !== undefined
			) {
			sourceMap = getSourceMap(path.node.loc.start, state)
			}

			const label =
			shouldLabel && autoLabel !== 'never'
			? getLabelFromPath(path, state, t)
			: null

			if (
			path.node.arguments.length === 1 &&
			t.isStringLiteral(path.node.arguments[0])
			) {
			let cssString = path.node.arguments[0].value.replace(/;$/, '')
			let res = serializeStyles([
			`${cssString}${
			label && autoLabel === 'always' ? `;label:${label};` : ''
			}`
			])
			let prodNode = t.objectExpression([
			t.objectProperty(t.identifier('name'), t.stringLiteral(res.name)),
			t.objectProperty(t.identifier('styles'), t.stringLiteral(res.styles))
			])

			if (!state.emotionStringifiedCssId) {
			const uid = state.file.scope.generateUidIdentifier(
			'__EMOTION_STRINGIFIED_CSS_ERROR__'
			)
			state.emotionStringifiedCssId = uid
			const cssObjectToString = t.functionDeclaration(
			uid,
			[],
			t.blockStatement([
			t.returnStatement(t.stringLiteral(CSS_OBJECT_STRINGIFIED_ERROR))
			])
			)
			cssObjectToString._compact = true
			state.file.path.unshiftContainer('body', [cssObjectToString])
			}

			if (label && autoLabel === 'dev-only') {
			res = serializeStyles([`${cssString};label:${label};`])
			}

			let devNode = t.objectExpression(
			[
			t.objectProperty(t.identifier('name'), t.stringLiteral(res.name)),
			t.objectProperty(t.identifier('styles'), t.stringLiteral(res.styles)),
			sourceMap &&
			t.objectProperty(t.identifier('map'), t.stringLiteral(sourceMap)),
			t.objectProperty(
			t.identifier('toString'),
			t.cloneNode(state.emotionStringifiedCssId)
			)
			].filter(Boolean)
			)

			return createNodeEnvConditional(t, prodNode, devNode)
			}

			if (canAppendStrings && label) {
			const labelString = `;label:${label};`

			switch (autoLabel) {
			case 'dev-only': {
			const labelConditional = createNodeEnvConditional(
			t,
			t.stringLiteral(''),
			t.stringLiteral(labelString)
			)
			appendStringReturningExpressionToArguments(t, path, labelConditional)
			break
			}
			case 'always':
			appendStringReturningExpressionToArguments(t, path, labelString)
			break
			}
			}

			if (sourceMap) {
			let sourceMapConditional = createNodeEnvConditional(
			t,
			t.stringLiteral(''),
			t.stringLiteral(sourceMap)
			)
			appendStringReturningExpressionToArguments(t, path, sourceMapConditional)
			}
			}
			}